PHP7 DataMapper

Structural/DataMapper/StorageAdapter.php

@@ -0,0 +1,30 @@
+<?php
+
+namespace DesignPatterns\Structural\DataMapper;
+
+class StorageAdapter
+{
+    /**
+     * @var array
+     */
+    private $data = [];
+
+    public function __construct(array $data)
+    {
+        $this->data = $data;
+    }
+
+    /**
+     * @param int $id
+     *
+     * @return array|null
+     */
+    public function find(int $id)
+    {
+        if (isset($this->data[$id])) {
+            return $this->data[$id];
+        }
+
+        return null;
+    }
+}